Stock Photo - Mar. 25, 1966 - The War In Vietnam -Helicopter Land Troops In Operation Against The Viet Cong: Phot shows U.S. troops find themselves waist high in Swampy fields as they jump the helicopters which have carries them into action against the Viet Cong. Over 400 troops took part in the raid to clean but smoke is from a phosphorous rocket used as a landing marker by an observation 'Bird Dog' plane. The Vietnam War, also known as the Second Indochina War, and also known in Vietnam as Resistance War Against America or simply the American War, was a Cold War-era proxy war that occurred in Vietnam, Laos, and Cambodia from November 1955 to the fall of Saigon on April 30, 1975. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)